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-rw-r--r--build/timestamp.cxx154
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diff --git a/build/timestamp.cxx b/build/timestamp.cxx
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+// file : build/timestamp.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license : MIT; see accompanying LICENSE file
+
+#include <build/timestamp>
+
+#include <unistd.h> // stat
+#include <sys/types.h> // stat
+#include <sys/stat.h> // stat
+
+#include <time.h> // localtime, gmtime, strftime
+
+#include <ostream>
+#include <system_error>
+
+using namespace std;
+
+namespace build
+{
+ // Figuring out whether we have the nanoseconds in some form.
+ //
+ template <typename S>
+ constexpr auto nsec (const S* s) -> decltype(s->st_mtim.tv_nsec)
+ {
+ return s->st_mtim.tv_nsec; // POSIX (GNU/Linux, Solaris).
+ }
+
+ template <typename S>
+ constexpr auto nsec (const S* s) -> decltype(s->st_mtimespec.tv_nsec)
+ {
+ return s->st_mtimespec.tv_nsec; // MacOS X.
+ }
+
+ template <typename S>
+ constexpr auto nsec (const S* s) -> decltype(s->st_mtime_n)
+ {
+ return s->st_mtime_n; // AIX 5.2 and later.
+ }
+
+ template <typename S>
+ constexpr int nsec (...) {return 0;}
+
+ timestamp
+ path_timestamp (const std::string& p)
+ {
+ struct stat s;
+ if (stat (p.c_str (), &s) != 0)
+ {
+ if (errno == ENOENT || errno == ENOTDIR)
+ return timestamp_nonexistent;
+ else
+ throw system_error (errno, system_category ());
+ }
+
+ return system_clock::from_time_t (s.st_mtime) +
+ chrono::duration_cast<duration> (
+ chrono::nanoseconds (nsec<struct stat> (&s)));
+ }
+
+ ostream&
+ operator<< (ostream& os, timestamp ts)
+ {
+ // @@ replace with put_time()
+ //
+
+ time_t t (system_clock::to_time_t (ts));
+
+ if (t == 0)
+ return os << "<nonexistent>";
+
+ std::tm tm;
+ if (localtime_r (&t, &tm) == nullptr)
+ throw system_error (errno, system_category ());
+
+ // If year is greater than 9999, we will overflow.
+ //
+ char buf[20]; // YYYY-MM-DD HH:MM:SS\0
+ if (strftime (buf, sizeof (buf), "%Y-%m-%d %H:%M:%S", &tm) == 0)
+ return os << "<beyond year 9999>";
+
+ os << buf;
+
+ using namespace chrono;
+
+ timestamp sec (system_clock::from_time_t (t));
+ nanoseconds ns (duration_cast<nanoseconds> (ts - sec));
+
+ if (ns != nanoseconds::zero ())
+ {
+ os << '.';
+ os.width (9);
+ os.fill ('0');
+ os << ns.count ();
+ }
+
+ return os;
+ }
+
+ ostream&
+ operator<< (ostream& os, duration d)
+ {
+ // @@ replace with put_time()
+ //
+
+ timestamp ts; // Epoch.
+ ts += d;
+
+ time_t t (system_clock::to_time_t (ts));
+
+ const char* fmt (nullptr);
+ if (t >= 365 * 12 * 24 * 60 * 60)
+ fmt = "%Y-%m-%d %H:%M:%S";
+ else if (t >= 12 * 24 * 60* 60)
+ fmt = "%m-%d %H:%M:%S";
+ else if (t >= 24 * 60* 60)
+ fmt = "%d %H:%M:%S";
+ else if (t >= 60 * 60)
+ fmt = "%H:%M:%S";
+ else if (t >= 60)
+ fmt = "%M:%S";
+ else if (t >= 1)
+ fmt = "%S";
+
+ if (fmt != nullptr)
+ {
+ std::tm tm;
+ if (gmtime_r (&t, &tm) == nullptr)
+ throw system_error (errno, system_category ());
+
+ char buf[20]; // YYYY-MM-DD HH:MM:SS\0
+ if (strftime (buf, sizeof (buf), fmt, &tm) == 0)
+ return os << "<beyond 9999 years>";
+
+ os << buf;
+ }
+
+ using namespace chrono;
+
+ timestamp sec (system_clock::from_time_t (t));
+ nanoseconds ns (duration_cast<nanoseconds> (ts - sec));
+
+ if (ns != nanoseconds::zero ())
+ {
+ os << '.';
+ os.width (9);
+ os.fill ('0');
+ os << ns.count ();
+ }
+ else if (fmt == 0)
+ os << '0';
+
+ return os;
+ }
+}